namespace SelfDrawRadioButton
{
	public partial class Form1 : System.Windows.Forms.Form
	{
		System.Windows.Forms.GroupBox m_group_box = new System.Windows.Forms.GroupBox();
		MyRadioButton m_radio_button1 = new MyRadioButton();
		MyRadioButton m_radio_button2 = new MyRadioButton();
		MyRadioButton m_radio_button3 = new MyRadioButton();

		public Form1()
		{
			try
			{
				InitializeComponent();

				m_group_box.Location = new System.Drawing.Point(10, 10);
				m_group_box.Size = new System.Drawing.Size(200, 110);
				m_group_box.Text = "GroupBox";
				Controls.Add(m_group_box);

				m_radio_button1.Location = new System.Drawing.Point(10, 20);
				m_radio_button1.AutoSize = true;
				m_radio_button1.Text = "RadioButton1";
				m_group_box.Controls.Add(m_radio_button1);
				m_radio_button2.Location = new System.Drawing.Point(10, 50);
				m_radio_button2.AutoSize = true;
				m_radio_button2.Text = "RadioButton2";
				m_group_box.Controls.Add(m_radio_button2);
				m_radio_button3.Location = new System.Drawing.Point(10, 80);
				m_radio_button3.AutoSize = true;
				m_radio_button3.Text = "RadioButton3";
				m_group_box.Controls.Add(m_radio_button3);

				m_radio_button1.CheckedChanged += M_radio_button1_CheckedChanged;
				m_radio_button2.CheckedChanged += M_radio_button2_CheckedChanged;
				m_radio_button3.CheckedChanged += M_radio_button3_CheckedChanged;
				m_radio_button1.Checked = true;
			}
			catch
			{
			}
		}

		/// <summary>
		/// チェックが変更された
		/// </summary>
		/// <param name="sender"></param>
		/// <param name="e"></param>
		private void M_radio_button1_CheckedChanged(object sender, System.EventArgs e)
		{
			try
			{
				if (false == m_radio_button1.Checked)
				{
					System.Console.WriteLine("RadioButton1 はチェックされていない。");
				}
				else
				{
					System.Console.WriteLine("RadioButton1 はチェックされている。");
				}
			}
			catch
			{
			}
		}

		/// <summary>
		/// チェックが変更された
		/// </summary>
		/// <param name="sender"></param>
		/// <param name="e"></param>
		private void M_radio_button2_CheckedChanged(object sender, System.EventArgs e)
		{
			try
			{
				if (false == m_radio_button2.Checked)
				{
					System.Console.WriteLine("RadioButton2 はチェックされていない。");
				}
				else
				{
					System.Console.WriteLine("RadioButton2 はチェックされている。");
				}
			}
			catch
			{
			}
		}

		/// <summary>
		/// チェックが変更された
		/// </summary>
		/// <param name="sender"></param>
		/// <param name="e"></param>
		private void M_radio_button3_CheckedChanged(object sender, System.EventArgs e)
		{
			try
			{
				if (false == m_radio_button3.Checked)
				{
					System.Console.WriteLine("RadioButton3 はチェックされていない。");
				}
				else
				{
					System.Console.WriteLine("RadioButton3 はチェックされている。");
				}
			}
			catch
			{
			}
		}
	}

	/// <summary>
	/// ラジオボタン
	/// </summary>
	public class MyRadioButton : System.Windows.Forms.RadioButton
	{
		/// <summary>
		/// マウスカーソルが乗っている
		/// </summary>
		protected bool m_is_mouse_over = false;

		/// <summary>
		/// 背景色
		/// </summary>
		public static System.Drawing.Color m_back_color = System.Drawing.Color.FromArgb(255, 100, 100, 100);
		/// <summary>
		/// マウスカーソルが乗っている状態の背景色
		/// </summary>
		public static System.Drawing.Color m_mouse_over_back_color = System.Drawing.Color.FromArgb(255, 150, 150, 150);
		/// <summary>
		/// チェックエリアの色
		/// </summary>
		public static System.Drawing.Color m_check_area_color = System.Drawing.Color.FromArgb(255, 255, 255, 255);
		/// <summary>
		/// チェックの色
		/// </summary>
		public static System.Drawing.Color m_check_color = System.Drawing.Color.FromArgb(255, 0, 128, 255);
		/// <summary>
		/// 前景色
		/// </summary>
		public static System.Drawing.Color m_fore_color = System.Drawing.Color.FromArgb(255, 255, 255, 255);
		/// <summary>
		/// マウスカーソルが乗っている状態の前景色
		/// </summary>
		public static System.Drawing.Color m_mouse_over_fore_color = System.Drawing.Color.FromArgb(255, 255, 255, 255);

		/// <summary>
		/// 再描画
		/// </summary>
		/// <param name="pevent"></param>
		protected override void OnPaint(System.Windows.Forms.PaintEventArgs pevent)
		{
			try
			{
				using (System.Drawing.StringFormat format = new System.Drawing.StringFormat())
				{
					int space_size1 = 0, space_size2 = 0;       // スペースのサイズ

					format.Alignment = System.Drawing.StringAlignment.Near;
					format.LineAlignment = System.Drawing.StringAlignment.Center;

					space_size1 = (int)(0.18f * (float)Height);
					space_size2 = (int)(0.28f * (float)Height);

					// マウスカーソルが乗ってない & フォーカスがない
					if ((false == m_is_mouse_over) && (false == Focused))
					{
						pevent.Graphics.FillRectangle(new System.Drawing.SolidBrush(m_back_color), pevent.ClipRectangle);
						pevent.Graphics.FillEllipse(new System.Drawing.SolidBrush(m_check_area_color), space_size1, space_size1, Height - (space_size1 + space_size1), Height - (space_size1 + space_size1));
						pevent.Graphics.DrawString(Text, Font, new System.Drawing.SolidBrush(m_fore_color), new System.Drawing.RectangleF(Height, 0, Size.Width - Height, Size.Height), format);
					}
					// マウスカーソルが乗っている
					else
					{
						pevent.Graphics.FillRectangle(new System.Drawing.SolidBrush(m_mouse_over_back_color), pevent.ClipRectangle);
						pevent.Graphics.FillEllipse(new System.Drawing.SolidBrush(m_check_area_color), space_size1, space_size1, Height - (space_size1 + space_size1), Height - (space_size1 + space_size1));
						pevent.Graphics.DrawString(Text, Font, new System.Drawing.SolidBrush(m_mouse_over_fore_color), new System.Drawing.RectangleF(Height, 0, Size.Width - Height, Size.Height), format);
					}
					// チェックが付いている
					if (true == Checked)
					{
						pevent.Graphics.FillEllipse(new System.Drawing.SolidBrush(m_check_color), space_size2, space_size2, Height - (space_size2 + space_size2), Height - (space_size2 + space_size2));
					}
				}
			}
			catch
			{
			}
		}

		/// <summary>
		/// マウスカーソルが触れた
		/// </summary>
		/// <param name="e"></param>
		protected override void OnMouseEnter(System.EventArgs e)
		{
			try
			{
				base.OnMouseEnter(e);
				m_is_mouse_over = true;
				Invalidate();
			}
			catch
			{
			}
		}

		/// <summary>
		/// マウスカーソルが離れた
		/// </summary>
		/// <param name="e"></param>
		protected override void OnMouseLeave(System.EventArgs e)
		{
			try
			{
				base.OnMouseLeave(e);
				m_is_mouse_over = false;
				Invalidate();
			}
			catch
			{
			}
		}
	}
}